Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Test: Phase Controlled Rectifiers - 1 - Electrical Engineering (EE) MCQ

Test: Phase Controlled Rectifiers - 1 - Electrical Engineering (EE) MCQ


Test Description

10 Questions MCQ Test - Test: Phase Controlled Rectifiers - 1

Test: Phase Controlled Rectifiers - 1 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Phase Controlled Rectifiers - 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Phase Controlled Rectifiers - 1 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Phase Controlled Rectifiers - 1 below.
Solutions of Test: Phase Controlled Rectifiers - 1 questions in English are available as part of our course for Electrical Engineering (EE) & Test: Phase Controlled Rectifiers - 1 solutions in Hindi for Electrical Engineering (EE) course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Phase Controlled Rectifiers - 1 | 10 questions in 30 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study for Electrical Engineering (EE) Exam | Download free PDF with solutions
Test: Phase Controlled Rectifiers - 1 - Question 1

In an SCR half wave rectifier, the forward breakdown voltage of SCR is 110 V for a gate current of 1 mA. If a 50 Hz sinusoidal voltage of 220 V peak is applied, the time during which SCR remains OFF would be equal to (assume load resistance is 100 Ω and the holding current to be zero)

Detailed Solution for Test: Phase Controlled Rectifiers - 1 - Question 1


Test: Phase Controlled Rectifiers - 1 - Question 2

When an SCR full wave rectifier is connected across a sinusoidal voltage of 400 sin 314t, the RMS value of the current flowing through the device is 20 A. The power rating of the SCR is

Detailed Solution for Test: Phase Controlled Rectifiers - 1 - Question 2

As the supply voltage is 400 sin 314t
Vm = 400 V,
Peak invesre voltage (PIV)

RMS value of current = 20 A 
Average value of current,

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Phase Controlled Rectifiers - 1 - Question 3

A single phase semi converter feed RLE load such that load current is constant for a firing angle of 90°. The input power factor will be

Detailed Solution for Test: Phase Controlled Rectifiers - 1 - Question 3

Input power factor = 

For α = 90o
Input power factor = 
= 0.6363 lag

Test: Phase Controlled Rectifiers - 1 - Question 4

A single phase semi converter is operated from a 50Hz, 111V ac source. If a resistive load of 50 Ω is connected at the dc terminals of converter and the averageoutput voltage is 25% of the maximum possible average output voltage, the average load current will be?

Detailed Solution for Test: Phase Controlled Rectifiers - 1 - Question 4

The average output voltage of a semiconverter 
Maximum output voltage = 

1 + cos α = 0.5
α = 120o
Average load current, 

Test: Phase Controlled Rectifiers - 1 - Question 5

A single phase full converter is connected to an AC supply of 330 sin 314t volts. It operates at firing angle The load current is maintained constant at 5A and load voltage is 140V. The angle of overlap due to effect of source will be

Detailed Solution for Test: Phase Controlled Rectifiers - 1 - Question 5

Average output voltage 


LS = 17.11 mH
Average load current 

µ = 6.627o

Test: Phase Controlled Rectifiers - 1 - Question 6

A single-phase full converter is connected across 230 V ac. Its average output voltage when firing angle is 30° is approximately equal to

Detailed Solution for Test: Phase Controlled Rectifiers - 1 - Question 6

The average output voltage for a single-phase full converter is

Test: Phase Controlled Rectifiers - 1 - Question 7

SCRs with peak forward rating of 1 kV and average on-state current rating of 40 A is used in single-phase mid-point converter. If the factor of safety is 2.5, then the power that this converter can handle is

Detailed Solution for Test: Phase Controlled Rectifiers - 1 - Question 7

Maximum voltage across SCR in single-phase mid-point converter is 2Vm. Therefore, this converter can be design for a maximum voltage of

∴ Maximum average power that the mid-point converter can handle is

Test: Phase Controlled Rectifiers - 1 - Question 8

The main advantages of the dual converter with circulating current operation is/are
1. the efficiency and power factor are more.
2. it has faster operation than dual converter without circulating current.
3. the thyristors are rated for lower current.

Choose the correct code from the following

Detailed Solution for Test: Phase Controlled Rectifiers - 1 - Question 8

Circulating current gives rise to more losses in the converters, hence the efficiency and power factor are low. Thus, statement-1 is false.
In a non-circulating current type dual converter, the normal delay period of 10 to 20 ms is required while no delay period is required in circulating current type dual converter. Therefore, circulating current type dual converter is faster than non-circulating type dual converter. Thus, statement-2 is true.
As the dual converter with circulating current has to handle load current as well as circulating currents, therefore the thyristors are rated for higher currents. Hence statement-3 is false.

Test: Phase Controlled Rectifiers - 1 - Question 9

 The average value of voltage of a single-phase ac voltage converter with resistive load is (α is the firing angle).

Test: Phase Controlled Rectifiers - 1 - Question 10

A four quadrant operation requires

Detailed Solution for Test: Phase Controlled Rectifiers - 1 - Question 10

In a four-quadrant operation, a system must be capable of handling both directions of current and voltage, meaning it can operate in all four quadrants of the voltage-current plane. This is commonly required in applications like regenerative braking, where power needs to flow in both directions.

  • Two full converters connected back to back allow for bidirectional power flow and can handle both positive and negative voltages and currents, making them suitable for four-quadrant operation.
  • The other configurations (series or parallel) do not provide the necessary bidirectional control needed for full four-quadrant operation.

Thus, two full converters connected back to back is the correct configuration for four-quadrant operation.

Information about Test: Phase Controlled Rectifiers - 1 Page
In this test you can find the Exam questions for Test: Phase Controlled Rectifiers - 1 solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Phase Controlled Rectifiers - 1, EduRev gives you an ample number of Online tests for practice

Top Courses for Electrical Engineering (EE)

Download as PDF

Top Courses for Electrical Engineering (EE)